New dye.



- tetrazo compounds wrr-nnnm nnnsnon'r, or nnvnaxusan,

mm concern; 6mm, lemma 'ro FABBENFAIBBIKEF'VORM. FRIEDB. BAYER & (30., OF EL'BEBFELD, GERMANY,'A

CORPORATION OF GERMANY.

No Drawing.

Specification of Letters Patent. Application filed July 2s,'191o. serial m. 574,92.

nnw nan.

Patented Jan. 16, 1912.

To all whom it may concern I Be it known thatI, WILHELM Bnnonon'r, doctor of philosophy, chemist, citizen of the German Empire, residing at Leverkusen,

have invented new near Cologne Germany 7 in New Dye, of

and useful Improvements which the following is a specification.-

My invention relates to the manufacture and production of new substantive azo dyes which can be obtained by combining the amin azo 2 amino 5 na phthol -7-sulfonic acid with one molecule of an azo dyestufi component,'especially nophenol, or a meta-diamin and with one molecule of 2-amino-5-naphtholr7-sulfonic acid.

The new dyes are in the shape of their alkaline salts dark powders which aresoluble in water generally with a blue color and which are so uble in concentrated sulfuric acid with a blue color. The dye cotton from blue to black shades; en on fiber they can be combined with diazo com ounds. Generally black shades are thus 0 tamed.

These shades-"can be discharged to a pure white. p

150 parts of para-aminoacetanilid are diazotized and introduced at 0 G. into a solution of 207 parts of sodium carbonate and 261 parts of sodium salt of 2-amino-5-naphthol-7-sulfonic acid. The combination is com lete after. a short time. In order to eliminate the acetyl group 2500 parts of caustic soda lye (30 per cent.) are added to .the mixture which is heated to boiling for some .time. The .saponified compound is then tetra-zotized in the usual way by acidulating, adding 300 parts of HGl (19.5? B.)

phenol, meta-phenylenediamin or their derivatives may be used.

and 138 parts of sodium nitrite and to the resulting tetrazo compound. a sooled solution of 94 arts of phenol and 350 parts of sodium car onate in 1000 parts of hot water is added. To the intermediate compoun a cooled solution of 260 parts of 2-ammo-5- naphthol-7' sulfonic acid and 150 parts of sodium carbonate is added. The .combination is complete after a short time. The new dye is salted out, filtered off and. dried.

from p ara-phenylenediphenol, resorcin, am1- The following formulae will illustrate the formation of the dyestuif N 11.0 HaCO Amlnoacetanilid.v

. as N==NC|o N-N-(llv Tetrazo compound. which is finally combined with henol and 1 molecule 2-amino-5-naphthol- -sulfonic acid which take the place of the twochlorin atoms in the formula of the tetrazo compound, the presence of the chlorin atoms bein due to the diazotation in hydrochloric acid solution. .4 The new dye is in the shape of its sodlum salt a dark powder which is soluble in water with a. blue color. It dyes cotton black shades. By treating in the usual way the dyed oods with diazotized para-nitranilin a blacfi is obtained which can be discharged to a pure whitewith hydrosulfites. Byreduction with stannous chlorid and hydrochloric acid the dye is split up. Para phenylenediamin, 2.6-diamino-5-naphthol-7- sulfonic acid and aminophenol are thus ob l. molecule "tained.

Instead of phenol, '-resorcin, meta-anima I clai'm:- 1. The hereinsdescribed azo dyestufis obd' tainable from tetrazo compounds, for which 2-amino-5 naphthol-7-sulfonic acid has been employed as coupler, which dyestufl's are in the sha e of their alkaline salts dark powdersso uble in water generally with. a blue I color, soluble in concentrated sulfuric acid with a blue color; dyeing cotton from blue to black shades, which can be developed on fiber with diazo compounds generally black 2. The herein described azo dyestufi' obtainable from para-aminoacetanilid, 2.5.7-

aminonaphthol sulfonic acid and phenol dark. powder soluble in water with a blue color, dyeing cottonblue shades, which can be combined with'diazotized para-nitranilin 5 blackshades being obtained, which can be (lischargedto a pure white and yielding 1 upon reduction with stannous chlorid an hydrochloric acid para-phenylenediamia 2.5:diamino-5-naphthol-7-sulfonic acid and 20 aininophenol, substant-iall as described.

In testimony whereof have hereunto set my' hand in the presence of two subscribing witnesses.

. WILHELM BERGDOLT. 1,. 8.] which is in the shape of its sodium'salt 2.

Witnesses:

CHAS. J. WRIGHT, WALTER VONNEGUT. 

